Abrasive amalgamating-mill.



J. B. S HACKEY.

ABRASIVE AMALGAMATING MILL.

APPLICATION FILED OCT-5| I910.

Patented Nov. 23, 1915.

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ABRASIVE AMALGAMATING MILL.

APPLICATION FILED 0cT.5 1910.

Patented Nov. 23, 1915.

4 SHEETS-SHEET 2- COLUMBIA PLANOGRAPN c0.. WASHINGTON. n. c.

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' J. B. SHACKEY.

ABRASIVE AMALGAMATING MILL.

APPLICATION FILED on. 5. 1910.

- 1 1 61 411 8. Patented Nov. 23, 1915.

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J. B. SHACKEY.

ABRASIVE AMALGAIVIATING MILL. APPLICATION FILED OCT. 5. 1910.

1,1 m ,4], Patented Nov. 23, 1915.

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JAMES B. SHACKEY, OF SAN FRANCISCO, CALIFORNIA.

ABRASIVE AMALeAMArinG-Mim.

Specification of Letters Patent.

Patented Nov. 23, 1915.

Application filed October 5, 1910. Serial No. 585,L78.

To all whom it may concern:

Be it known that I, JAMns B. SHAOKEY, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented a new and useful Abrasive Amalgamating- Mill, of which the following is a specification in such full and clear terms as will enable those skilled in the art to construct and use the same. 7

This invention relates to an amalgamating mill and its object is to provide a mill of the Chili roller type which will give a considerable abrasive action in addition to the grinding effect for the more complete amalgamation of gold and silver ores.

It will be understood by those skilled in the art that in the type of mill having a series of rolls which rotate around upon a fixed horizontal die that the roll diameter with respect to die width is such that practically no rubbing effect is present. The result of this is, that while the mill has con siderable crushing effect that it does not act well upon ores which require considerable abrasion in addition to the grinding thereof for the complete amalgamation of metallic values therein.

Another disadvantage of many mills of this type is that the track die and shoes Wear unevenly. Since when a groove starts to form in either, the tendency is to continue the deepening thereof, while if the rollers have some rubbing effect on the die, the tendency is to maintain'both rollers and die practically smooth until they are worn out.

Another object of theinvention is to provide a bearing for the grinding roll which will be easily sealed oil tight, thus'preventing the accumulation of oil fromdropping into the oil compartment and interfering with amalgamation, and to make the roll and shaft supporting the same readily dismountable from the machine. I

Another object of the invention is to provide a set of grinding rolls which will have all of the weight of themovingparts' of the mill supported thereby and thus avail able for use in grinding the ore.

In the drawings in which the same numeral of reference is applied to the same portion'throughout the several views, Figure l is a side elevation of the mill, a portion of the Weight carrying hopper being broken away to illustrate the position of the feed hopper; Fig. 2 is a anties or the mill with the weight carrying hopper and feeding device removed therefrom; Fig. 3 is a vertical sectional view showing the position of three of the rollerswith respect to the die, and grinding pan; Fig. 4: is a view in elevation of the frame used to hold the rollers in engagement with the die; Fig. 5 is a side elevation of the same frame; Fig. 6 is a sectional view of a portion of the mill pan illustrating-the position of the die and sand'and mercury clean-up openings; Fig. 7 is a vertical sectional view illustratingthe manner of securing the roll to the shaft carrying the same; Fig. 8 is a view looking at the roll at right angles to the face thereof to illustrate the manner of securing the same to the roll and to illustrate the manner of securing the bearings to the roll shaft; Fig. 9 is a front elevation of a slightly modified form of the'mill, the weight-carrying hopper and feeding apparatus being removed therefrom; Fig. 10 is a plan View of the modified. form of the mill without the feeding apparatus and weight hopper; Fig. 11 is a vertical sectionalview on the dotted line 11-11 shown in Fig. 10. Fig. l2 is a sectional view through'one of the'journal boxes showing the interior construction thereof, the plane of section being perpendicular to the plane of separation of the two halves ofthe box; and Fig. 13 is an end elevation of one of said journal boxes looking from the right, Fig. 12. v V

The numeral 1 represents the foundation of the mill said foundation being of any suitable material. This foundation has a laterally extending portion 2 which supports the grinding shaft 3, bearing supports l and vertical pinion shaft 5, the latter carrying a bevel gear 6 in mesh with a bevel gear 7 on the shaft 3 asWell 'as a large pinion 8, said large pinion being in mesh with a driving gear 9 of the mill.

A flanged conical support 17 is secured to the foundation at the center of the die, said support having a horizontal key-way 18 through said support for the driving gear ,9. The angle 1 ring 26 and flat ring are- ,eonnected toto the'ring 26 and said ge er by m a f four arm 285 aid m being connected at their inner ends to the flange of the'support 21 All", the outer ends of the arms 28, angle braces 29 ar e -secu red arms for-the purpose of strengt en ng the dr ving fram of the mill, 1

' The shafts 23 pass Over the top of the rings 2.5- and 26 and extend outwardly to the dr ing g ar T e e sha tee e P le around with the driving of an inverted U shaped frame 30 having braces v31 on each side thereof and which frame is secured on the top of the angle ring 26; Each shaft is held down against the ring. 26 by means of a heavy spring 32 on a pin 33 having a bearing 34 at the lower end thereof, said bearing being suitably guided in the frame 30 in its upward motion.

The result of the above construction is that'any individual roll may be raised a small amountivhen passing over an unbreakable substance such as a hammer, drill or a nut'without raislng the entire load carried 7 bythe; mill.

Each shaft carries a roller 35 revoluble thereon and is held in place on said shaft by means .of a bearing orjournal box 36. The bearing 36 isdivided into two precisely similar portions each of which is provided with a key way 37 for a key 38, said key being adapted tly nt h r ll 35; T t o p t of each bearing are bolted together;

ch shaft 23 is provided with a flange-39 wh l g han the sa d S s d flange bei g a pte t net s a h aring f ie ies of el ls 4 p ed n e s eev ee-r th e nte of the b ar gs 3 said a s being d m ed he take up th e d thrus of i he telle 35 911- the sh f 23'- I tell rs-.41 plated iz it 1 hee tha the f ction ,ef the sellers hie-t re at en may he a sma l a neee ble nch. th -eha 231, e al y of small the hearing @853 nthelei ts d -jeteaeh Q f fih two eet -ef-ihell bearings. V

gear 9 by means to draw the parts of the bearing 36.

The bearing 36 is lubricated through a channel 41 in the shaft 23 from an oil cup 42. In order that the oil, when used, may not be dropped into the pulp and thus interfere with the amalgamation of the gold or silver, each of the bearings 36 is provided with a packing ring 43 at the inner end and with a packing ring 44 at the outer end thereof, said rings being suitably secured to said bearing by means of bolts.

It is to be observed that in the form of mill above described that the smallest circumference of the roller is placed upon the outside thus causing the differential travel ofthe-surface of the periphery thereof with respect to the die, since the outside of the roller must travel farther than the inside and a considerable abrasive action is thus produced. The result being that the die and roll shoe will be worn down smoothly, and the metal will be brightened ready for amalsa eti n- In order that sufficient weight may be placed upon the rollers to accomplish the necessary grinding, a bin 45 is supported above the rollers by means of uprights 46 over each of the shafts, and said bin is also supported by means of inclined braces 47 which extend downwardly to the support 21.

At the center of the bin is a feed hopper 48, and from the feed hopper a feed pipe 49 leads downwardly in front of each of the rollers.

It is to be noted that the objects accomplished by the mill shown in the foregoing figures may be accomplished in a different way by placing the shafts supporting the mill rolls slightly non-radial. In this form of the invention a foundation 50 is used, and the mill may be driven from a shaft 51 supported in bearings 52 and 53, the shaft 51 having a pinion '54 thereon in mesh with a large bevel gear 55 on a vertical main drive shaft 56. The shaft 56 is supported by means of a step bearing 57 and a bearing 58 secured to the upper portion of the foundation 50 and pan 59, in which is placed a track 60, which surrounds the shaft and forms the grinding compartment of the mill. This pan has an upwardly extending inner ring 61 and an upwardly extending ring 62 at the outer edge thereof, the latter having two screens63 discharging into a pulp box :64 and slidably supported on the shaft 56 is a flanged hub 65, surrounding which is a flat ring 66, said flat ring being connected to the flanged hub b means of a plurality of flat bars 67 Theflanged hub is provided with eight upwardly projecting heavy lugs 68, there being two for each shaft 69 and said'lugs are so placed that-when the shafts 69 are conea ed therew th a d sec re t e t th y wi l ate d rom the surnert 6. nadiel' yshaft nesees t ro g a f me 5' secured upon the ring 66, and each shaft is held down by means of a heavy spring 79 upon a pin 73 which carries a bearing the same as the bearing 3% at its lower end, said bearing resting upon the top of the shaft 69. Each shaft 69 is provided with flanges 7 5 and 7 6 near the outer end thereof, said flanges on a ball 78 and forming means whereby the outward thrust of the rotating rolls is frictionally minimized.

Surrounding the end of each shaft is a conical split box 7 7 which is assembled upon the shaft before being placed in position in the roll, a series of balls 78 being provided for each of the flanges 75 and 76 to bear upon, while rollers 7 9 are provided to reduce the rolling friction of the grinding rollers, upon the shafts supporting them.

A cover 80 is bolted to the outer end of the split box to prevent the escape of the lubricant therefrom, while a packing gland 81 is bolted to the inner end of the box for the same purpose. A lubricant being supplied to the shaft by means of a cup 82 and channel 83. After being assembled upon the shaft and bolted together, the bearings are slipped into position in the rollers 35 and are held in place thereon by means of wedges 8 1 and 85, set screws 84 and 85 being used to secure the wedges in place.- In this form of the invention, it will be observed that the rollers are substantially cylindrical in shape, but that the off-setting of the shaft upon which they rotate causes them to travel over the die with a more or less sliding or rubbing action, this tending to rub up and brighten any metallic products in the ore being pulverized, while it also reduces the tendency of the rollers to form grooves in the die and shoe. It is understood, of course, that suitable weighting and feeding mechanism may be added to this type of mill, as well as to the type previously described, but such mechanism is omitted for the sake of clearness.

Each of the mills is provided with a sand outlet S and a mercury outlet M to be used when it is desired to clean out the mill at the end of the run.

The operation of the mill above described is as follows: The pulverized ore is fed to the mill from the feed hoppers in front of each roll and more or less mercury, as demanded by the ore under treatment is also placed in the grinding compartment of the mill, such a' quantity of mercury beingplaced in the mill to start with as will provide a mercury surface entirely around the grooves on the outside and inside of the die. The mill rollers are then rotated at such a speed as may be deemed necessary, and in their travel over the track die they cause a considerable rubbing and abrasion of the ore in addition to the grinding effect, thus tending to scour the small particles of metal more than is the case in a stamp mill or in a plain roller mill in which the two grinding surfaces travel at substantially the same speed. It is to be noted that this is especially necessary in those ores which are more or less oxidized and which have a c0nsiderable coating of iron oxid over the metal particles, but it is also advantageous in more freely amalgamable ores, since they too will amalgamate easier if rubbed slightly.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States, is as follows In a grinding mill, a pan, a track die therein, a drive shaft, a spider revoluble with said shaft and slidable freely thereon, outwardly extending shafts connected with the spider and movable in a vertical plane at their outer ends, said shafts being above a portion of the spider and upon which they may rest, a roller on each outwardly extending shaft, and springs between the outwardly extending shafts and the spider to support said spider and to equalize the load on the several rollers.

In testimony whereof I have hereunto set my hand this 16th day of September, A. D. 1910, in the presence of the two subscribed witnesses.

J AMES B. SHACKEY. Witnesses:

C. P. GRIFFIN, CHARLES R. HOLTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

